AQ dequeue message lost after session killed

Hello all,

I have an issue with DBMS_AQ.deQueue. When my session did a dequeue and is killed after that (before a commit or rollback), the particular message is permanently removed from the queue. I would expect it to still be in the queue, or at least be in the exception queue. I perform the following steps to test:

1. Enqueue from session 1, and commit. (see code below)

2. Dequeue from session 2. (see code below)

3. Session 1: select * from MY_Q_T -> my message is still visible here.

4. Session 2: select * from MY_Q_T -> my message is not visible anymore.